Btrfs: drop spin lock when memory alloc fails

Drop spin lock in convert_extent_bit() when memory alloc fails,
otherwise, it will be a deadlock.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index be1bf62..49f3c9d 100644 (file)
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -935,8 +935,10 @@ again:
        node = tree_search(tree, start);
        if (!node) {
                prealloc = alloc_extent_state_atomic(prealloc);
-               if (!prealloc)
-                       return -ENOMEM;
+               if (!prealloc) {
+                       err = -ENOMEM;
+                       goto out;
+               }
                err = insert_state(tree, prealloc, start, end, &bits);
                prealloc = NULL;
                BUG_ON(err == -EEXIST);
@@ -992,8 +994,10 @@ hit_next:
         */
        if (state->start < start) {
                prealloc = alloc_extent_state_atomic(prealloc);
-               if (!prealloc)
-                       return -ENOMEM;
+               if (!prealloc) {
+                       err = -ENOMEM;
+                       goto out;
+               }
                err = split_state(tree, state, prealloc, start);
                BUG_ON(err == -EEXIST);
                prealloc = NULL;
@@ -1024,8 +1028,10 @@ hit_next:
                        this_end = last_start - 1;
 
                prealloc = alloc_extent_state_atomic(prealloc);
-               if (!prealloc)
-                       return -ENOMEM;
+               if (!prealloc) {
+                       err = -ENOMEM;
+                       goto out;
+               }
 
                /*
                 * Avoid to free 'prealloc' if it can be merged with
@@ -1051,8 +1057,10 @@ hit_next:
         */
        if (state->start <= end && state->end > end) {
                prealloc = alloc_extent_state_atomic(prealloc);
-               if (!prealloc)
-                       return -ENOMEM;
+               if (!prealloc) {
+                       err = -ENOMEM;
+                       goto out;
+               }
 
                err = split_state(tree, state, prealloc, end + 1);
                BUG_ON(err == -EEXIST);